v3.26.1
Fair Value Measurements - Summary of Plan"s Investments at Fair based on Valuation Inputs (Details) - EBP 002 - USD ($)
Dec. 31, 2025
Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value $ 460,943,536 $ 393,328,692
Money Market Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 276,802 296,537
Berkshire Hathaway Class B Common Stock Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 13,806,299 12,636,838
Mutual Funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 437,253,013 193,794,197
Common/Collective Trusts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value   176,639,823
Level 1    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 451,059,312 206,431,035
Level 1 | Money Market Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 1 | Berkshire Hathaway Class B Common Stock Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 13,806,299 12,636,838
Level 1 | Mutual Funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 437,253,013 193,794,197
Level 1 | Common/Collective Trusts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value   0
Level 2    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 276,802 176,936,360
Level 2 | Money Market Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 276,802 296,537
Level 2 | Berkshire Hathaway Class B Common Stock Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 2 | Mutual Funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 2 | Common/Collective Trusts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value   176,639,823
Level 3    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3 | Money Market Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3 | Berkshire Hathaway Class B Common Stock Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3 | Mutual Funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3 | Common/Collective Trusts    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value   0
Level 1 2 and 3    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 451,336,114 383,367,395
Net Asset Value | VRSTIII    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value $ 9,607,422 $ 9,961,297